Mounting for flexible capsules for operating transmissions



Nov. 14, 1950 2,529,909

T. BOWEN MOUNTING FOR FLEXIBLE CAPSULES FOR v OPERATING TRANSMISSIONSFiled July 17. 1947 'INIIQNTOR Patented Nov. 14, 1950 MOUNTING FORFLEXIBLE CAPSULES FOR OPERATING TRANSMISSIONS Tom Bowen, Brighton,England, a'ssignor to Pullars Instruments Limited (formerly PullarsElectric Co.

(Brighton)v Limited), Brighton,

England, a British company Application July, 1947, Serial No. 761, 726In Great Britain December 6, 1945 Section 1, Public Law 690, August 8,1946 Patent expires December 6, 1965 4 Claims. 1

This invention relates to mountings for flexible capsules for operatingtransmissions, and is particularly concerned with pressure indicators,such as aneroid barometers.

According to this invention, a mounting for a flexible capsule foroperating a transmission is characterised in that the transmission isfixed relatively to the main frame against movement as a whole in thedirection of the deflection of the capsule, and in that the capsule ismounted on a part which is adjustable relatively to the main frame insaid direction of deflection.

In one construction according to this invention, the part on which thecapsule is mounted is resilient and is fixed to or formed integrallywith said main frame, and adjusting means are provided for deflectingsaid resilient part.

For example, the main frame may comprise a metal plate and the resilientpart may comprise a tongue which is punched out of the metal of theplate so as to be secured thereto at one end, while an adjusting screwsecured to said plate is arranged to engage the free end of said tongue.

The aforesaid set-screw may be carried by a bridge piece which isarranged to extend across the slot formed in the plate by the punchingout of said tongue.

The aforesaid bridge piece may be provided by two lugs, each of which ispunched out of the metal of said plate flanking the aforesaid slot, 1

and bent back upon the plate so that the ends of the lugs abut oneanother, or are closely adjacent one another.

In order to provide a hole which may be tapped to receive saidset-screw, the aforesaid lugs are so punched out of the material thattheir ends are provided with a semi-circular recess, which recesses whenarranged opposite one another provide the aforesaid hole. The end of theadjusting screw may be located in a recess formed at or near the end ofsaid tongue.

The following is a description of the invention as applied to abarometer movement, reference being made to the accompanying drawings,in which:

Figure 1 is a side elevation of the barometer movement, and

Figure 2 is an underplan view of Figure 1.

The main frame carrying the barometer movement comprises a base plate Informed from mild steel or other comparatively resilient material, and towhich is secured three pillars l I to which is secured a bridge plate I2. The bridge plate in its turn is provided with three pillars [3 onwhich is mounted an outer plate M. The bridge 2 plate I2 has secured toit two posts l5 between which is pivotally mounted a rockshaft IS, theposts being provided with the usual adjustable pivot bearings H. Therockshaft is provided with a lever-arm [8 which overlies a projection l9on a barometer capsule 20. The barometric capsule is adjustably mountedin relation to the base plate I!) in the following manner. A tongue-2|of a shape shown in Figure 2 is punched out of the metal of the baseplate so as to be secured thereto at one end 22 thereof; while the otherend is engaged by a set-screw 23 having a countersunk head located in ahole in said other end of the tongue and the screw-threaded stem ofwhich engages a part of the base plate hereinafter described. Theunderside of the barometric capsule 20 is provided with a threaded stem30 which passes through a hole in the tongue 2| and is engaged by aclamping nut 24. Two lugs 25 are punched out of the metal of the baseplate and are bent back upon one another so that their extremities lieclose to one another and bridge the slot 26 from which the aforesaidtongue 2| has been cut. The punching operation of the aforesaid lugs issuch as to provide a recess in each end thereof forming a hole which isscrew-threaded to receive the set-screw 23. The gaps 21 left in the baseplate are thus formed at one end thereof with small projections 28resulting from the stamping out of the recesses which receive theset-screw. The base plate is also provided with holes 29 for attachmentto a support.

The tongue 2| is initially bent sufliciently to locate the barometriccapsule at one required limit of its adjustable movement. Thus, byrotating the set-screw 23 by means of a slot in the end thereof, thetongue may be drawn towards the base plate while rotation of theset-screw in the opposite direction permits the tongue to returnautomatically under the resilient action thereof.

I claim:

1. An instrument responsive to changes of pressure comprising a metalmounting plate, a resilient tongue punched out of said plate so as to besecured thereto at one end, a set screw engaging a threaded hole in saidplate and engaging said tongue so as to adjust its flexure, a capsulemounted on said tongue and having at least one flexible wall adapted tobe subjected to varying pressure, a mechanical transmission mounted onsaid plate and having a part connected to said capsule.

2. An instrument responsive to change of prestongue and having at leastone flexible wall adapted to be subjected to varying pressure, amechanical transmission mounted on said plate and having a partconnected to said capsule.

3. An instrument responsive to change of pressure comprising a metalmounting plate, a resilient tongue punched out of said plate so as to besecured thereto at one end and leaving a slot in said plate, a bridgepiece extending across said slot and attached to said plate which bridgepiece comprises two lugs punched out of the metal of the plate on eitherside of said slot and bent back on the plate so that their ends approachone another, a set screw engaging a threaded hole formed between saidends and engaging said tongue, a, capsule mounted on said tongue andhaving at least one flexible wall adapted to be subjected to varyingpressure, a mechanical transmission mounted on said plate and having apartconnected to said capsule.

4. An instrument responsive to change of pressure comprising a metalmounting plate, a resilient tongue punched out of said plate so as to besecured thereto at one end and leaving a slot 4 in said plate, a bridgepiece extending across said slot and attached to said plate which bridgepiece comprises two lugs punched out of the metal of the plate on eitherside of said slot so as to be attached to the plate at one end and eachto have V a half circular slot at the other which lugs are bent back onthe plate so that their ends abut With the half circular holes inregister, a set screw engaging threads on the resulting hole andengaging said tongue, a capsule mounted on said tongue and having atleast one flexible wall adapted to be subjected to varying pressure, amechanical transmission mounted on said plate and having a partconnected to said capsule.

TOM BQWEN.

REFERENCES CITED The following references are of record in the file ofthis patent:

V UNITED STATES PATENTS Number

